Agreed w above 2 posts. Except for the soy milk - not best option.
Watch with your mom this great video made by a doctor supervising fasts: https://www.youtube.com/watch?v=Nl8Y5jV0hN0&app=desktop
She may change her opinion by doing so.
You start eating watery fruits if you can't make fresh juices, and you chew them really well.